In this chapter, we describe how ISDs are discovered and how they coordinate with each other, especially when a new ISD is created. The goal is for each ISD to have a list of all other ISDs — specifically, an identifier and a description for each ISD along with the roots of trust that enable authentication. An authority could create such a list and distribute it, but this would conflict with SCION’s goal that each ISD can operate independently and communicate with other ISDs without any globally trusted entity.
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